That sounds like a good idea. Maybe after a bit of expressing you might find your nipples heal and you may want to try again.
BF'ing can be so hard to begin with, if you do manage to get past the rocky-ness at the beginning it does get easier. I had bleeding cracks and so much pain for about the first 8 weeks, i really sympathies, it was horrible, toe curling pain and i didn't look forward to feeding at all. But down the track i was very grateful to still be able to BF. It made my life much easier at times.

If it doesn't work out for you, that's ok too.

Regardless, how ever you chose to feed your baby is certainly no indication of how 'good' you are as a mother. So what ever path you choose, be happy with it and don't feel guilty.